Mailing List Message #11421
From: Global Homes Webmaster <>
Subject: Re: SIMS and MacDNS (Was: How to get SIMS and server andeverythingto work right.)
Date: Tue, 6 Aug 2002 12:54:28 -0700
To: <>
X-Mailer: Mailsmith 1.5.3 (Blindsider)
On 08/06/02 at 11:48, Mark Wheeler wrote:

> OK, I'll use a secondary DNS that is not on my same IP.
> How long will it take to see the effects of the changes I make? Will
> it be right away?

>From your local network, you should see changes immediately. For people
outside your LAN, it depends on whether or not their resolvers have your
previous info cached and, if so, what the TTLs (Times To Live) of the
relevant records are.

> I did some testing on my MacDNS and it looks like I have no A records,
> according the tests I ran.

One of the less critical flaws of MacDNS is that it doesn't use the correct
terminology for resource record types. It calls A records 'Permanent Hosts'
and CNAMEs 'Aliases.' At any rate, here's a zone transfer of the zone from

% dig axfr

@                       1D IN SOA       ns1 hostmaster (
                                        9               ; serial
                                        8H              ; refresh
                                        2H              ; retry
                                        1W              ; expiry
                                        1D )            ; minimum

                        1D IN NS        ns1
                        1D IN NS        ns2
ns1                     1D IN A
                        1D IN MX        10 @
www                     1D IN CNAME     ns1
mail                    1D IN CNAME     ns1

There is only one A record, and that's for The MX
record points to ('@' is a placeholder for the zone
name), but there's no A record for That means that
there's no way to resolve the MX to an IP address, so other mail servers
can't find your mail server to send mail to you.

At minimum, you need to point the MX record at a host name that has a
corresponding A record ('permanent host') and you need an A record for ns2.
If you keep the MX above, you should add a permanent host record for that points to your mail server's IP address. Also, it
would probably be better to have the MX point to a specific host like In that case, you'd want to change the record for
'mail' from a CNAME ('alias') to an A ('permanent host').

> How do I make sure the A records are correct?

Trash MacDNS and run a real name server. On Mac OS, QuickDNS is an
excellent choice, although not free.

                   Christopher Bort |
            Webmaster, Global Homes |
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